Regular Expressions 101

Save & Share

  • Regex Version: ver. 2
  • Update Regex
    ctrl+⇧+s
  • Save new Regex
    ctrl+s
  • Add to Community Library

Flavor

  • PCRE2 (PHP >=7.3)
  • PCRE (PHP <7.3)
  • ECMAScript (JavaScript)
  • Python
  • Golang
  • Java 8
  • .NET 7.0 (C#)
  • Rust
  • Regex Flavor Guide

Function

  • Match
  • Substitution
  • List
  • Unit Tests

Tools

Sponsors
There are currently no sponsors. Become a sponsor today!
An explanation of your regex will be automatically generated as you type.
Detailed match information will be displayed here automatically.
  • All Tokens
  • Common Tokens
  • General Tokens
  • Anchors
  • Meta Sequences
  • Quantifiers
  • Group Constructs
  • Character Classes
  • Flags/Modifiers
  • Substitution
  • A single character of: a, b or c
    [abc]
  • A character except: a, b or c
    [^abc]
  • A character in the range: a-z
    [a-z]
  • A character not in the range: a-z
    [^a-z]
  • A character in the range: a-z or A-Z
    [a-zA-Z]
  • Any single character
    .
  • Alternate - match either a or b
    a|b
  • Any whitespace character
    \s
  • Any non-whitespace character
    \S
  • Any digit
    \d
  • Any non-digit
    \D
  • Any word character
    \w
  • Any non-word character
    \W
  • Non-capturing group
    (?:...)
  • Capturing group
    (...)
  • Zero or one of a
    a?
  • Zero or more of a
    a*
  • One or more of a
    a+
  • Exactly 3 of a
    a{3}
  • 3 or more of a
    a{3,}
  • Between 3 and 6 of a
    a{3,6}
  • Start of string
    ^
  • End of string
    $
  • A word boundary
    \b
  • Non-word boundary
    \B

Regular Expression
No Match

/
/
gm

Test String

Code Generator

Language

Generated Code

package main import ( "regexp" "fmt" ) func main() { var re = regexp.MustCompile(`(?m)load_date\\\":\s+\\\"(?<load_date>[^\\]+)`) var str = ` {"_c0":{"0":"[","1":" {","2":" \"table_name\": \"pc_dwh_rdv.gdh_ls2lo_s99\"","3":" \"deleted_count\": 18","4":" \"redelivered_count\": 0","5":" \"load_date\": \"2023-07-27\"","6":" }","7":" {","8":" \"table_name\": \"pc_dwh_rdv.gdh_spar_s99\"","9":" \"deleted_count\": 8061","10":" \"redelivered_count\": 1","11":" \"load_date\": \"2023-07-27\"","12":" }","13":" {","14":" \"table_name\": \"pc_dwh_rdv.gdh_tf3tx_s99\"","15":" \"deleted_count\": 366619","16":" \"redelivered_count\": 0","17":" \"load_date\": \"2023-07-27\"","18":" }","19":" {","20":" \"table_name\": \"pc_dwh_rdv.gdh_wechsel_s99\"","21":" \"deleted_count\": 2","22":" \"redelivered_count\": 0","23":" \"load_date\": \"2023-07-27\"","24":" }","25":" {","26":" \"table_name\": \"pc_dwh_rdv.gdh_revolvingcreditcard_s99\"","27":" \"deleted_count\": 1285","28":" \"redelivered_count\": 0","29":" \"load_date\": \"2023-07-27\"","30":" }","31":" {","32":" \"table_name\": \"pc_dwh_rdv.gdh_phd_s99\"","33":" \"deleted_count\": 2484","34":" \"redelivered_count\": 204","35":" \"load_date\": \"2023-07-27\"","36":" }","37":" {","38":" \"table_name\": \"pc_dwh_rdv.gdh_npk_s99\"","39":" \"deleted_count\": 1705","40":" \"redelivered_count\": 0","41":" \"load_date\": \"2023-07-27\"","42":" }","43":" {","44":" \"table_name\": \"pc_dwh_rdv.gdh_npk_s98\"","45":" \"deleted_count\": 1517","46":" \"redelivered_count\": 0","47":" \"load_date\": \"2023-07-27\"","48":" }","49":" {","50":" \"table_name\": \"pc_dwh_rdv.gdh_kontokorrent_s99\"","51":" \"deleted_count\": 12998","52":" \"redelivered_count\": 0","53":" \"load_date\": \"2023-07-27\"","54":" }","55":" {","56":" \"table_name\": \"pc_dwh_rdv.gdh_gds_s99\"","57":" \"deleted_count\": 13","58":" \"redelivered_count\": 0","59":" \"load_date\": \"2023-07-27\"","60":" }","61":" {","62":" \"table_name\": \"pc_dwh_rdv.gdh_dszins_s99\"","63":" \"deleted_count\": 57","64":" \"redelivered_count\": 0","65":" \"load_date\": \"2023-07-27\"","66":" }","67":" {","68":" \"table_name\": \"pc_dwh_rdv_gdh_monat.gdh_phd_izr_monthly_s99\"","69":" \"deleted_count\": 1315","70":" \"redelivered_count\": 0","71":" \"load_date\": \"2023-07-27\"","72":" }","73":"]"}}` for i, match := range re.FindAllString(str, -1) { fmt.Println(match, "found at index", i) } }

Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Golang, please visit: https://golang.org/pkg/regexp/